Roof structure



H. E. MARKS ROOF STRUCTURE Jan. 5 1926.

original Filed gust 51. 1920 ATTORN EYS mt... Jan. 5, 1926.

Bass-urn mmnnar E. imnxafor GLEN osngzaivn, PENNSYLVANIA.-

. ori inal no. 1,398,079, we November-32, 1921, Serial No. 407,1,89, filed Au usts1, 92o 1, 5

' reissue fled October 15,

- To all whom it may com-em:

Be it known that-I, HERBERT residing at Glen Osborne, in the county of Allegheny, State of Pennsylvania, have invented certain new and useful Improvements in Roof Structures; and I' do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable others skilled in the art towhich -it a pertains to make and use the same. a

T is invention relates to roof structures. provide a roof structure which is fire proof, which forms" an efficient heat insulator, which is light in weight, low

in cost, which can be easily and cheaply erected, and which nevertheless is strong and durable. I

Generally stated theinvention comprises a'roof structure containingmetallic angle members and a substantially monolithic and reinforced slab of gypsum or similar mateiii.

rial, combined andassembled in the novel hereinafter described.

the accompanying drawings Figure 1 is a vertical section of an inclined roof constructed in accordance with the invention;

Fig. 2' shows a portion of Fig. 1 on an enlarlgled scale; and Fig. 3 is a section taken at rig t angles to that of Figs. 1 and 2 on a' still larger scale.

, The invention is applicable to a roof of any type, and in the drawings is shown as applied in a double sloping or rid e roof. In the drawings 1 indicates a suitab e frame truss orpart of the building on which the I roof is supported and 2 indicates purlins .Alloft for sup otring the roof structure roper. hese parts areillustrated as ormed of structural steel, and obviously can be of any material, character or design, depending upon the kind and size of the roof.

The roof structure proper comprises a plurality of angle bars, specifically of the pe known as T-bars, 3, which rest with their base flanges upon the purlins and are suitably secured thereto and with their legs projecting upwardly. These T-bars 'form the base for the roof structure proper and will be spaced sufficiently close that the distancetherei n can be bridgedv by ordinary sizes of plaster or gypsum'boards, whic are articles of commercial manufacture and sale, being generally composed of molded E. MARKS,

1925. seflal No. 62,617.

thin, usually about three-eighths of an inch 1 in thickness. The plaster "or gypsum boards are shown at 4, having their side edges resting upon and supported by the horizontal flanges 5 of the T-bars 3, as shown in Fig. 3. These gypsum boards can be chosen of any suitable length, but preferable of a length substantiall ,equal to the space. between adjacent pur ins 2, but instead of extending from puilin to purlin they are so placed that their central ortions are substantially above purlins, wlth their end portions meeting about midway between adjacent purlins. .Tosupport the endportions of these plaster boards it is preferred to use small angle members 6, of a length equal to the distance between adjacent T-bars 3, and having their ends resting upon the flanges 5 of said T-bars, as a'r'esult of which the I thin plaster boards are supported not only pair of angle bars or channels placed back to back may be utilized, and likewise instead of the angle bars 6 placed back to back as shown, small T-bars or channels may be used.

The plaster boards 4, placed in the manner described, serve as centering for the formation of the roof slab, and also as the lower facing of the roof slab. The roof slab is formed from suitable cementitious material, such as gypsum, which .is mixed with the proper proportion of water and then molded directly in place, that is, by being poured upon the centering formed by the plaster boards 4. The composition of this. cementitious material is preferably the same as that of' the plaster boards but in any event' is of such nature that when poured in place it bonds on to the plaster boards so that the latter and the solidified cementitious" material form a unitaryor monolithic slab.

Preferably this slab will be reinforced by embedding in the cementitious material suitable metallic reinforcement 7, referably a metallic mesh, such' as metalllc lath,

wire mesh, or the like. This metallic, remforcement 'may be in the form of sheets extending across, and-resting u on the up- "per edges of the angle bars 6 an being supported thel'atter andfthereby' properly, spaced from the plaster .bo'ardls' t, the upward projection of the aligle'bars 6 preferr below the center of the upwardly projectin legs of the- T bars, so that the meta in orcement will be embedded close, to the lower face of the slab. This metallic mesh ably bein somewliat'greater than the thickness of t e 'plaster boards, but terminating will be either one continuous strip extending from the caves to the ridge of the roof, or may be composed of a number of pieces, the ends of which are overlapped so, that when embedded inthe cementitious mate 'rial it has the same reinforcing effect as though a continuous strip of material were used; also if desired, the edge portions of the metallic reinforcementmay be bent upwardly and made to overlap the upper edges of the T bars 3, as shown at 8, Fig. 3,

- sons to also secure a continuous, additional transverse tie; or the strips of reinforcement may run across the T bars 3, and bend downbetween the T bars, with their edges overlapping to give in effect a continuous v reinforcement, when embedded in the cewhich is reinforced for its entire length mentitious-material, from eave to ridge and also transversely of the roof. The cementitious material which'is poured onto the centering plaster boards 4 readily passes through this metal mesh and bonds to the plaster boards. Such material will be filled in to a depth somewhat greater than that of' the T bars 3 so that no portion of the metal frame is exposed on the top surface.

The roof structure described is of simple construction, is easy and cheap to construct,

.is light, and with all is very-strong, inas much as the entire structure,'including the plaster boards,- forms a monolithic slab and width, and is, therefore, eapable of standing a very considerable load. This slab'is reinforced not only by the metal mesh described, but also -by the T bars 3 and angle bars 6 which become thoroughly embedded and bonded in the cementitlous' material. The'consequence is that themetal members can be of light crosssectlon, and

the slab of minimum thickness.

Since the plaster boards which form the bottom surface of this slab serve as. centertion.

ing, the usual centering for erecting roofs of this kind can be entirely dispensed with, thus making a great saving in cost oferec The top surface of this roof structure will be suitably water-proofed by any of the usual waterproofingmethods, such as by applying thereto a coating of 'asphaltum' or the like, and can be finished in an desired way of finishing roofs of this 'nd,

- such as by providing the same with a gravel or" other surface.

, In'case thBCBmQHtItIOHS material is such as to form a strong slab, such ascement,

the members 4 need not necessarily be of a composition to bond with the cementitious material, but may be of the so-called commercial beaver board or like thin board.

Iclaim:

1. A roof of the character described comprising purlins, metal angle members supported on the purlins andpresenting op pos telyprojecting flanges; small metal angle members located intermediate the purlins and extending between the first named angle members and resting on the flanges of the latter, and also presenting oppositely projecting flanges, thin composition boards supportedat their sides on the flanges of the first named angle members and at their ends-0n the flanges of the second named angle members, metallic reinforcement 'supported on the second named angle members, and a cementitious slab molded in place on thewomposition boards to such thickness as to project'materially above the first named angle members.

2. A roof of the character described,

comprising purlins, metal angle members supported on the same and presentin oppositely projecting flanges, small metal angle members extending between the first named angle members and resting'on the flanges of the latter and also presenting oppositely,

projecting flanges, plaster boards supported on their side edges on theflanges of the 'first named anglemembers' and at their end edges on the flanges of the second named anglemembers, and a cementitious body molded in place on the plaster boards and bonding therewith and extending above the said first named angle members, thereby forming a monolithic roof slab.

3. A roof of the eharacter described, comprising purlins, metal angle members supported. on thepurlins and presenting oppositely projecting flanges, plaster boards supported on said flanges, metal reinforcing fabric supported over and in spaced relation to said plaster boards and forming a the means for holding adjacent edges of I said boards in alignment. p

4. A roof of the character described,

com risin urlins metal an le members.

supported on th'elpurlins an presenting oppositely projectingflanges, plaster boards supported on said flanges, metal reinforcing fabric supported over and in spaced relation to said plaster boards and forming a continuous reinforcementfor the length of said angle members, transverse supporting means for holding-adjacent edges of said plaster boards substantially in alignment witheach other, and a cementitious body molded onto the plaster boards and bonding therewith and of a depth matei-ially'greater than said angle members, thereby forming a monolithic roof slab including the plaster 10 board, cementitious'body, metal reinforcement and said transverse supporting means. In testimony whereofI-affix my signature.

HERBERT E, MARKS. 

